To solve the problems of weak signal strength and low signal-to-noise ratio in traditional Raman spectroscopy, a new confocal Raman system is proposed in this paper. The absolute conjugation of the confocal point is realized by external photonic crystal fiber. The technical problems in the coupling process of photonic crystal fiber are summarized, and the actual samples are tested. Compared with conventional confocal Raman fibers such as Thorlabs and OZ and Witec 532 nm-alpha300R Raman system, the signal-to-noise ratio in this paper is 73.8382 at the same laser intensity and integration time, which is significantly higher than that of Thorlabs and OZ (37.1557 and 40.0342, respectively). Compared with the signal-to-noise ratio of 65.5312 for Witec 532 nm-alpha300R, it also increased by 12.68%. High-quality Raman signal makes the absolute conjugated confocal Raman system have broad market prospects and ultra-high market competitiveness.